The hard bone has dulled up the knife blade.
这硬骨头把刀刃弄钝了。
But the shark jerked backwards as he rolled and the knife blade snapped.
但是鲨鱼朝后猛地一扭，打了个滚，刀刃啪地一声断了。
They found there was only a rusty knife-blade in the box.
他们发现箱子里只有一把生锈的小刀刀刃。
They found there was only a rusty knife-blade in the box.
他们发现箱子里只有一把生锈的小刀刀刃。
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